ASTM B Standard Specification for Autocatalytic (Electroless) Nickel- Phosphorus Coatings on Metal. This specification covers requirements for. A S T M BENGL W Ob T A U 4Tb – m AMERICAN origioauy published as B direct responsibility of Subcommittee B Advanced Plating Technologies, a Milwaukee, Wisconsin company, provides electroless nickel plating per MIL-C, ASTM B and AMS as well as.
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Use the test methods described in 9. It will vary depending on loads, type of indenter, and operator.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. After 3 min, apply a b733-977 of potassium ferrocyanide prepared by dissolving 1 g of potassium ferrocyanide and 1.
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This standard is also available to be included in Standards Subscriptions. Then remove the part, air dry, and examine for rust spots, which indicate pores. Rejection and Rehearing Add to Alert PDF. Coatings with phosphorus contents greater than The tests for these qualication requirements shall be performed monthly or more frequently. The weight percent of phosphorus shall be in the range designated by type classication see 4.
Report the mean and standard deviation for the coating. The heat treatment temperature was considerably higher than typical processing and was chosento evaluate the formation of diffusion products of iron, nickel and phosphorus.
NOTE 2—The performance of the autocatalytic nickel coating depends to a large extent on the surface nish of the article to be plated and how it was pretreated. For maximum accuracy, a minimum coating thickness of 75 m is recommended. When Guide B is specied, the purchaser and producer need to agree on the plan to be used.
After 3 min contact, rinse, and apply a solution of alizarin sulfonate prepared by dissolving 1. NOTE 14—To protect the edges, electroplate the specimens with a minimum of 5 m of nickel or copper prior to cross sectioning. If an alternate test is specied it shall be agreed upon between the producer and the purchaser.
Specication B may be consulted for a list of post treatments that are widely used. For each of the three specimens complete the following steps: The purchaser and producer may agree on the xstm s to be used. Please first log in with a verified email before subscribing to alerts. The location of rack or wire marks in the coating shall be agreed upon between the producer and purchaser. Careful selection of the pre and post heat treatments are recommended.
Test Method B contains four sampling plans, three for use with tests that are nondestructive and one for use with tests that are destructive. In the case of dissatisfaction occurs with the results of a test, the producer may make a claim for a hearing. Materials and Manufacture 6. The instrument shall aastm calibrated with deposits plated in the same solution asmt the same conditions on magnetic steel.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. A suitable method shall activate the surface and remove oxide and foreign materials, which may cause poor adhesion and coating porosity. This standard has been approved for use by agencies of the Department of Defense. It is characterized by industrial atmosphere exposure on steel substrates in dry or oiled environments.
Duration of the test is cycles and it can be extended to 25 cycles for more complete results. Make three closely spaced indentations and examine under magnication for aking or blistering of the coating, which is cause for rejection.
We have no amendments or corrections for this standard. NOTE 4—The purchaser should furnish separate test specimens or coupons of the basis metal for test purposes to be plated concurrently with the articles to be plated see 8. Originally published as B — The corrosion resistance of the coating to a specic liquid medium can be determined by means of immersion tests see Practice G 31 or electrochemical test see Practices G 5 and G Individual alloys should be tested for maximum hardness attainable, especially for conditions of lower temperatures and longer times.
Any red spots remaining indicate b7333-97. Apply heat to the beaker at such a rate that the water begins to boil in not less than 15 min, nor more than 20 min after the initial application of heat.
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When specied in the purchase order or contract, a report of the test results shall be furnished. Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. Insertion of a sharp probe at the interface of the coating and basis metal to determine the adhesion is suggested. NOTE 17—Appropriate test specimens are strips approximately 25 to 50 mm wide, to mm long and 3 to 6 mm thick. Test specimens are available from Taber.